Get some freezer paper, put a piece over your plans and trace your parts onto the paper side ( there is a paper side and a "plastisized" side). Cut them out roughly to shape and then iron the tracing (Plastisized side against the wood) onto your wood. You will have to experiment a bit with the heat to get the right adhesion. The traced part is now adhered to the wood and, if properly applied, will stick there very well while you cut and sand to shape. When the part is done, the tracing will peel off easily. It may take a little experimentation but once you get the "hang of it" it is quite easy and quick. I have also had success scanning the part(s) and printing them onto the paper with my printer but that is another story.